This study is a prospective active comparator study to assess the immune response elicited by human recombinant agalsidase therapy in subjects who are switching from agalsidase alfa to agalsidase beta with Fabry disease. Fabry disease is an X-linked lysosomal storage disorder, due to deficient alpha-galactosidase A activity. The progressive accumulation of globotriaosylceramide (GL-3) in the lysosomes of the vascular endothelial cells of multiple organ systems like the kidneys, heart, skin, and brain, leads to a microvascular disease. In Fabry disease, nephropathy dominates and renal function impairment occurs as a result of accumulation of GL-3 in renal cells